Public bug reported:

This is not a consistent problem, but occurs frequently.

When I click a link in, for instance, an email I get an error message
'Firefox is already running' and the link does not open. Killing firefox
and clicking the link when it is not running is OK.

I also cannot always kill firefox from my own user id. See below:

xxxx@w500:~$ killall -9 firefox
firefox(29317): Operation not permitted
firefox: no process found
xxxx@w500:~$ sudo !!
sudo killall -9 firefox
[sudo] password for xxxx: 
xxxx@w500:~$ [NPAPI 31210] ###!!! ABORT: Aborting on channel error.: file 
/build/firefox-yz6GCb/firefox-40.0.3+build1/ipc/glue/MessageChannel.cpp, line 
1659
[NPAPI 31210] ###!!! ABORT: Aborting on channel error.: file 
/build/firefox-yz6GCb/firefox-40.0.3+build1/ipc/glue/MessageChannel.cpp, line 
1659


lsb_release -rd
Description:    Ubuntu 14.04.3 LTS
Release:        14.04

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: firefox 40.0.3+build1-0ubuntu0.14.04.1
ProcVersionSignature: Ubuntu 3.16.0-49.65~14.04.1-generic 3.16.7-ckt15
Uname: Linux 3.16.0-49-generic x86_64
AddonCompatCheckDisabled: False
ApportVersion: 2.14.1-0ubuntu3.13
Architecture: amd64
AudioDevicesInUse:
 USER        PID ACCESS COMMAND
 /dev/snd/controlC1:  raph       2080 F.... pulseaudio
 /dev/snd/controlC29: raph       2038 F.... panel-4-mixer
 /dev/snd/controlC0:  raph       2038 F.... panel-4-mixer
                      raph       2080 F.... pulseaudio
BuildID: 20150826185918
Channel: Unavailable
CurrentDesktop: XFCE
Date: Tue Sep 22 11:55:54 2015
ForcedLayersAccel: False
IfupdownConfig:
 # interfaces(5) file used by ifup(8) and ifdown(8)
 auto lo
 iface lo inet loopback
IncompatibleExtensions:
 English (GB) Language Pack - langpack-en...@firefox.mozilla.org
 English (South Africa) Language Pack - langpack-en...@firefox.mozilla.org
 Hebrew (IL) Language Pack - langpack...@firefox.mozilla.org
 Default - {972ce4c6-7e08-4474-a285-3208198ce6fd}
InstallationDate: Installed on 2015-06-03 (110 days ago)
InstallationMedia: Xubuntu 14.04.2 LTS "Trusty Tahr" - Release amd64 
(20150218.1)
IpRoute:
 default via 192.168.1.254 dev eth0  proto static 
 192.168.1.0/24 dev eth0  proto kernel  scope link  src 192.168.1.109  metric 1 
 192.168.1.0/24 dev wlan0  proto kernel  scope link  src 192.168.1.110  metric 9
MostRecentCrashID: bp-d6f07efe-631c-48bd-bcff-51d852150427
Plugins: Shockwave Flash - /usr/lib/flashplugin-installer/libflashplayer.so
PrefSources: prefs.js
Profiles: Profile0 (Default) - LastVersion=40.0.3/20150826185918
RunningIncompatibleAddons: True
SourcePackage: firefox
SubmittedCrashIDs:
 bp-d6f07efe-631c-48bd-bcff-51d852150427
 bp-a1e63f24-f0b0-4f6d-b0a7-546b92150427
 bp-d4405603-b1ad-4bfe-a493-c04992150426
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 01/09/2009
dmi.bios.vendor: LENOVO
dmi.bios.version: 6FET56WW (2.02 )
dmi.board.name: 4063A46
dmi.board.vendor: LENOVO
dmi.board.version: Not Available
dmi.chassis.asset.tag: 1780238
dmi.chassis.type: 10
dmi.chassis.vendor: LENOVO
dmi.chassis.version: Not Available
dmi.modalias: 
dmi:bvnLENOVO:bvr6FET56WW(2.02):bd01/09/2009:svnLENOVO:pn4063A46:pvrThinkPadW500:rvnLENOVO:rn4063A46:rvrNotAvailable:cvnLENOVO:ct10:cvrNotAvailable:
dmi.product.name: 4063A46
dmi.product.version: ThinkPad W500
dmi.sys.vendor: LENOVO

** Affects: firefox (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug trusty

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https://bugs.launchpad.net/bugs/1498428

Title:
  Clicking a link in an email gets 'firefox is already running' error

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